Numerical simulation of Martian historical dynamo: Impact of the Rayleigh number on the dynamo state |
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| Authors: | TianYuan Wang WeiJia Kuang ShiZhuang Ma |
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| Institution: | (1) Laboratory for Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China;(2) Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
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| Abstract: | The observed Mars remnant magnetism suggests that there was an active dynamo in the Martian core. We use the MoSST core dynamics
model to simulate the Martian historical dynamo, focusing on the variation of the dynamo states with the Rayleigh number Ra
(a non-dimensional parameter describing the buoyancy force in the core). Our numerical results show that the mean field length
scale does not vary monotonically with the Rayleigh number, and the field morphology at the core mantle boundary changes with
Rayleigh number. In particular, it drifts westward with a speed decreasing with Rayleigh number.
Supported by National Natural Science Foundation of China (Grant No. 40328006) |
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| Keywords: | Mars magnetic field Rayleigh number dynamo |
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